docs: def read_sps(path):
      """Read a LibSVM file line-by-line.
  
      Args:
          path (str): A path to the LibSVM file to read.
  
      Yields:
          data (list) and target (int).
      """
  
      for line in open(path):
          # parse x
          xs = line.rstrip().split(' ')
  
          yield xs[1:], int(xs[0])